[llvm] [RISCV] Default to MicroOpBufferSize = 1 for scheduling purposes (PR #126608)

[Pengcheng Wang via llvm-commits]

wangpc-pp wrote:

> Did the swap from NoSchedModel to SchedMachineModel change some default latencies?

No I don't think so. But we may need to define sched classes for `GenericModel`.

Besides, you may try it with `-mllvm -misched-cyclicpath=false`:
https://github.com/llvm/llvm-project/blob/6fb1d40992ac3aff84dfe7616ea7776e1c26ba99/llvm/lib/CodeGen/MachineScheduler.cpp#L3544-L3547
I think this is the major influenced part apart from cycles.

https://github.com/llvm/llvm-project/pull/126608